4 wheeled kart problem

I am trying to create a kart (similar to mario kart 64), where it acts like a 4 wheeled kart but doesnt flip over.

Below is a video of mario kart 64.
http://youtube.com/watch?v=PpHiTKApQmU

The problem is my kart seems to rotate or even flip over (especially if it crashes into another kart). I was to fix this by raising the flags NX_BF_FROZEN_ROT_X and NX_BF_FROZEN_ROT_Z, however this prevents my kart from being able go up/down ramps.


Any advice would be appreciated

The most easiest trick is to lower the centre of mass of the kart, you could also look into damping as well.